(KTUL) -- The California couple accused of shackling their 13 children until one escaped earlier this month were planning a move to Oklahoma "within days" of their arrests, according to ABC News.

Sources tell ABC News that David Turpin, 57, was relocating with defense contractor Northrop Grumann, though it's not clear where in Oklahoma the family was moving.

"There were boxes in the house consistent with moving -- concentrated in hallways, entryway and bedrooms," according to an ABC News source.

Turpin and wife, 49-year-old Louise Turpin, are charged with 12 counts of torture, 12 counts of false imprisonment, seven counts of abusing a dependent adult and six counts of child abuse. David Turpin is also charged with one count of performing a lewd act on a child younger than 14 by force, fear or duress. Both have pleaded not guilty.

The couple is accused of abusing their children for years, allowing them to shower just once a year and regularly beating them.

David and Louise Turpin were arrested after their 17-year-old daughter escaped through an upstairs window Jan. 14 and called 911 on a deactivated cellphone. When police discovered the siblings, ages 2 to 29, all but the toddler were severely malnourished. The oldest child, a 29-year-old woman, weighed just 82 pounds.